/*
 * Copyright (C) 2009 M. Hautle.
 * 
 * This file is part of TrackedBean.
 * 
 * TrackedBean is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later version.
 * 
 * TrackedBean is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along with TrackedBean. If not, see <http://www.gnu.org/licenses/>.
 */
package ch.trackedbean.loaders.internal.lazy;

import ch.trackedbean.loaders.*;
import ch.trackedbean.loaders.internal.*;
import ch.trackedbean.loaders.lazy.*;

/**
 * Manager for {@link ILazyLoader}s.
 * 
 * @author M. Hautle
 */
public final class LazyLoaderManager {
    /** The loaders. */
    private static final LoaderList<ILazyLoader> LOADERS = new LoaderList<ILazyLoader>(ILazyLoader.class);

    /**
     * Default constructor.
     */
    private LazyLoaderManager() {
    }

    // CHECKME overridable lazy loaders? - flag in annotation + bei gesetztem flag die declaring class ignorieren
    /**
     * Loads the value of the given property.
     * 
     * @param <T> The type of the declaring class
     * @param declaringClass The declaring class
     * @param bean The concerned bean
     * @param property The property to load
     * @return The value of the property.
     * @throws NoLoaderException If no loader was found
     * @throws LazyLoadingException If something went wrong during the load
     */
    @SuppressWarnings("unchecked")
    public static <T> Object loadProperty(Class<T> declaringClass, T bean, String property) throws NoLoaderException {
        final ILazyLoader<T> loader = LOADERS.getService(declaringClass);
        try {
            return loader.loadProperty(declaringClass, bean, property);
        } catch (Exception e) {
            throw new LazyLoadingException(declaringClass, property, e);
        }
    }
}
